is short for baby gangsta just like OG means old gangsta or original gangsta BG is baby gangsta.

B.G is short for baby gangster. The youngsters in the click who want to be gangsters but are not quite there yet. They usually the gofers of the group

B G means Baby Gangsta. this is someone in a click that has not killed (or shot) any one yet. Where as an OG, or original Gangsta has.

You have the "Bubble Gutts"
When you have to use the bathroom really bad and your stomach is boiling and bubbling. Not to mention you are probably doing alot of farting.

B G is the letter definition for a Black Girl. When the term BG was created, it spawned such terms as

IG, CG, PG, and DUB.
B G was the founder word, that started it all.

B G is used as the short form for a sexy black girl.

B G stands for Blonde Girl. Blonde girls are an entity all their own, superior to all other females. Phenomenal BGs are BGs with tan bodies, huge breasts, tight asses, and girls you walk by and just want to do right then and there.